Key bolt



Mar. 6, 1923. 1,447,810

J. P. NORTHEY KEY BOLT Filed Dec. 17, 1921 INVEN'I'UP,

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ATT-- Patented Mar. 6, 1923.

arren STATES PATENT OFFWE.

KEY BOLT.

Application filed. December 17, 1921. Serial No. 523,188.

To all whom it may concern;

Be it known that I, JOHN PELL NORTHEY, of the city of Toronto, county of York, Province of Ontario, Canada, a subject of the King of Great Britain, have invented certain new and useful Improvements in Key Bolts, of which the following is a specification. i

- This invention relates to slotted bolts adapted to be used with-wedge keys such as shown and described in United States Letters Patent 1,266,334, dated May 14th, 1918. Bolts of this type are known which are formed by bending a half-round bar of metal upon itself, which bar is deformed in various ways to form a slot, a divided un slotted portion of the stem and a head, and it is to such bolts that my present invention particularly relates.

For use in railway shipbuilding and structuralmetal work there is a demandfor key bolts which will pass through a hole of a given size and in which the stem adjacent the head of the bolt will snugly fit said hole, andit is my object to provide a suitable bolt for that purpose.

In forming my bolt I take a half-round bar of metal and without deforming it double it upon itself while maintaining the parts adjacent the bend sufficiently spaced to form the slot. The flat sides of-the half round bar after leaving a sufiicient length of slot are brought into juxtaposition to form a cylindrical divided stem.

The free ends of the half-round bar are then upset to form a neck of the same diameter as a hole through which the slotted end of the bolt will. just pass. The ends are then further upset vto form the bolt head.

In the upsetting process the parts may be welded togetherif desired. I

The upsetting of the ends will usually be efiected while the bolt is held in a suitable die, and this die may be utilized to cause the external contours of the slotted portion of the bolt stem to conform to those of the neck.

The bolt is illustrated in the accompanying drawings in which Fig. 1 is a side elevation of the bolt;

Fig. 2 a cross section on the line 2-2 Fig. 1

Fig. 3 a cross section on the line 33 Fig. 1; and

Fig. I a cross section of a modified form of bolt having an oval neck.

The neck, when made oval in cross'section, will usually have the major axis of its cross section at a small angle to the planes of the sides of the slots, so that when the oval hole in an angle bar is horizontal as is usually the case, and the bolt neck fitted therein, the planes of the sides of the slot inclines upwardly somewhat from the horizontal so that a key may be readily driven in without interference by or with an adjoining bolt.

What I claim as my invention is:

1. A slotted key bolt formed of a metal blank bent on itself and comprising a slotted end portion; a main stem portion, a head and an enlarged neck portion adjacent the head, the slotted end portion being of greater diameter than the main stem portion but of substantially the same cross sectional area of metal 2. A slotted key bolt constructed as set forth in claim 1 in which the neck is oval in cross section with the major axis of its cross section at an angle to the planes of the sides of the slot.

JOHN PELL NORTHEY. 

